scsi: ibmvfc: Add protocol field to target structure

Add a per target protocol field so target code can determine correct
protocol specific actions as well as identify the correct channel group
target list.

Signed-off-by: Tyrel Datwyler <tyreld@linux.ibm.com>
Link: https://lore.kernel.org/r/20230921225435.3537728-12-tyreld@linux.ibm.com


Reviewed-by: Brian King <brking@linux.vnet.ibm.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>